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  #1  
Old 10-21-2017, 05:10 PM
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Bosch - Bremi - Eldor Ignition coils for N62

Inspected today my ignition coils and thinking this is maybe causing my high fuel consumption.

My X5 starts and runs fine.....no issues whatsoever.

I'm about to order ignition coils if whether changing these might improve my fuel economy.

What do you guys recommend and experience with these brands?

Bosch vs Bremi vs Eldor?

Currently, still on original Bosch [email protected] miles

Monitored engine roughness via INPA and all reads the same and seems fine.

I've checked Realoem and found a NEWER version Eldor 12138657273.
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Old 10-21-2017, 05:22 PM
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If a motor isn't skipping then ignition fixes are not likely to help fuel economy much.

Dirty air filter, dirty fuel filter, sluggish mass air flow meter, tired o2 sensors, clogged cats and such are the areas that usually effect gas mileage.
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Old 10-21-2017, 05:37 PM
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That's what I assume too.

I do routine maintenance on my X5 almost every 5k.

I've replaced all filters (air - fuel - oil) 02 sensors but NOT cats converters?

I'm constantly monitoring the engine via INPA and cannot see any anomalies on anything.

Experimented with Premium fuel (98 RON) from different service stations as well.

And for giggles......tried 91 and 95 RON!

.............and made no or little whatsoever........except lost a bit of torque down low.
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Old 10-21-2017, 06:06 PM
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What gas mileage are you getting or liter per whatever?

X5's are not really mpg machines. My X5 gets 16.something most of the time according to the lie-o-meter and sometimes it makes it into the 17's.

This is mostly in town and lots of idling. On the highway I get 26 or so with my 3.0 X5.

I use the cruise all the time when I can.
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Old 10-21-2017, 06:49 PM
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I get 13.5 mpg consistently with my 4.6iS with mainly Bay Area commute traffic. Lots of slow freeway time.
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Old 10-21-2017, 09:44 PM
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Averaging between 8 to 9.5 km/l at combined city/freeway driving this year.

Roughly....18 to 21 mpg.

I remembered doing 11 to 12 km/l mostly speeds hovering 80-100 kmh.

Tyres have always been Latitude Diamaris.

It's a big difference from 11 km/l to 8 km/l !!

No change in driving style...
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Old 10-21-2017, 10:16 PM
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Ok here is a fun one to try you said constantly monitoring thru the obd port. Try a tanks worth without monitoring any or at least a short term test by resting the mileage meter and running without monitoring anything for a drive somewhere you used to. Longer time the better but you may notice a difference pretty fast.
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Old 10-22-2017, 11:19 AM
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Getting mostly 16.4 MPG in my 4.4i sport. Changed out spark plugs and saw an improvement in idling even though the old plugs looked fine. Worth a shot.

Here's a refresher vid I recorded of the process:

https://www.youtube.com/watch?v=_OgFBDO92KI
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Old 10-22-2017, 03:15 PM
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16.4 mpg ....that's were I want to be.

Cool video!
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  #10  
Old 10-22-2017, 04:28 PM
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Quote:
Originally Posted by jopecasa View Post
Inspected today my ignition coils and thinking this is maybe causing my high fuel consumption.

My X5 starts and runs fine.....no issues whatsoever.

I'm about to order ignition coils if whether changing these might improve my fuel economy.

What do you guys recommend and experience with these brands?

Bosch vs Bremi vs Eldor?

Currently, still on original Bosch [email protected] miles

Monitored engine roughness via INPA and all reads the same and seems fine.

I've checked Realoem and found a NEWER version Eldor 12138657273.

Either Bosch or Bremi will be fine. Have you checked for codes? Not that unusual that a coil starts to fail are 100,000 miles or more but if there is no miss, especially when the engine is first started they should be OK. Check to make sure engine goes from open to closed loop.
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